I don't know about that. If entire countries still can't build one, I'm not sure al qaida will be able to. Plus, if some rogue scientist was selling a working model, a country like Iran could pay a much higher price for it.
But the attacks of 9/11 aren't really an apt analogy here. The 9/11 attacks were similar to what happened in Arizona, pretty much anybody can do it if they are motivated enough, it doesn't require any technical knowledge or highly specialized and costly equipment.
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